Fixed Dockerfile download #90

Job	Run time
Building tools for aarch64-unknown-linux-gnu on ubuntu20.04	29m 37s
Building tools for aarch64-unknown-linux-gnu on ubuntu20.04	57m 20s
Building for aarch64-unknown-linux-gnu on ubuntu20.04	29m 35s
Building for aarch64-unknown-linux-gnu on ubuntu20.04	3h 52m 23s
Building for x86_64-unknown-linux-gnu on ubuntu-20.04	18m 9s
Building for x86_64-unknown-linux-gnu on ubuntu-20.04	28m 26s
Building for x86_64-apple-darwin on macos-latest	17m 51s
Building for x86_64-apple-darwin on macos-latest	52m 17s
Building for x86_64-pc-windows-msvc on windows-2022	17m 58s
Building for x86_64-pc-windows-msvc on windows-2022	31m 48s
Build Docker image for ${{ matrix.platform }}	1s
Merge and push Docker manifest	1s
Merge and push Docker manifest	10s
Build Docker image for linux/amd64	40s
Build Docker image for linux/arm64	1m 40s
	8h 37m 56s

Provide feedback